Can anyone give any information on this piece I just picked up?

Article about: Hey all I just got back from a car boot sale and picked up some old gun powder flask. Done some research online, found a few websites that have similar sort of thing to what I have: 728: Col

But can't find the exact item or any information on it. These ones seem to have the same picture on both sides, whereas mine has different ones. and also my belt clasps are on the same side, whereas the ones I find have the clasps on either side. I need anyone who can shine any information at all onto what I have here.